Hello, I am wanting a mbp and I am unsure which to go with. I like the mobility of the 13" but I'm not sure if it will be powerfull enough. My current machine is a Hp with a quad core phenom at 1.8 ghz, 9400gt, and 4 gig of ddr2. I work with photoshop extended, after effects, premeire pro, lightwave, blender, and I hope to use xcode. I am sort of ok with the render times on my current machine. Would the 13" do good, or would I be better of with the 15"" 2.66?